Axial exchange currents and the spin content of the nucleon

D. Barquilla-Cano, A. J. Buchmann, E. Hernandez

In a chiral quark model where chiral symmetry is introduced via a non-linear sigma model, we evaluate the axial couplings g_A(0), g_A^8(0) and g_A^0(0 )related to the spin structur…